Hydroxyethyl cellulose (HEC) ndi ether yosungunuka m'madzi ya nonionic cellulose, ndipo gwero lake lalikulu ndi cellulose wachilengedwe. Ma cellulose achilengedwe amapezeka kwambiri m'zomera ndipo ndiye gawo lalikulu la makoma a cell. Makamaka, cellulose ya hydroxyethyl imapangidwa ndi cellulose yachilengedwe yokhala ndi ethylene oxide pansi pamikhalidwe yamchere. Njira yamankhwala iyi imatchedwa ethoxylation, ndipo zotsatira zake ndikuti magulu a hydroxyl pa mamolekyu achilengedwe a cellulose amasinthidwa pang'ono kapena kwathunthu kuti apange cellulose ya hydroxyethyl yokhala ndi magulu a ethoxy.
Zotsatirazi ndi njira zenizeni za kukonzekera kwa hydroxyethyl cellulose:
Gwero la cellulose: Ma cellulose nthawi zambiri amatengedwa kuzinthu zamitengo monga thonje ndi matabwa. Ma cellulose ochotsedwa amayeretsedwa ndikuyeretsedwa kuti achotse zonyansa monga lignin, hemicellulose ndi zigawo zina zopanda cellulose kuti apeze cellulose yoyera kwambiri.
Chithandizo cha alkalinization: Sakanizani cellulose ndi concentrated sodium hydroxide (NaOH) solution, ndipo magulu a hydroxyl mu cellulose amachita ndi sodium hydroxide kuti apange sodium cellulose. Pochita izi, mawonekedwe a cellulose amakula mpaka kufika pamlingo wina, zomwe zimapangitsa kuti zikhale zosavuta kuchitapo kanthu ndi ethylene oxide.
Ethoxylation reaction: Alkalized sodium cellulose imasakanikirana ndi ethylene oxide (C2H4O) pa kutentha kwina ndi kuthamanga. Mapangidwe a mphete ya ethylene oxide amatsegula kupanga magulu a ethoxy (-CH2CH2OH), omwe amaphatikiza magulu a hydroxyl pa ma cellulose kupanga hydroxyethyl cellulose. Izi ndondomeko akhoza kuchitidwa mosiyanasiyana, chifukwa mu hydroxyethyl mapadi ndi madigiri osiyana m'malo.
Pambuyo mankhwala: mankhwala pambuyo anachita zambiri amakhala osakhudzidwa alkali, zosungunulira ndi zina zopangira. Kuti mupeze cellulose yoyera ya hydroxyethyl, njira zochiritsira pambuyo pake monga kusalowerera ndale, kutsuka ndi kuyanika ndikofunikira. Cholinga cha njira zochizirazi ndikuchotsa zotsalira za alkali, zosungunulira ndi zinthu zina kuti mupeze chomaliza choyeretsedwa.
Ma cellulose a Hydroxyethyl akhala akugwiritsidwa ntchito kwambiri m'mafakitale osiyanasiyana chifukwa chamankhwala ake apadera komanso magwiridwe antchito abwino kwambiri. Makamaka, cellulose ya hydroxyethyl imakhala ndi kusungunuka kwamadzi bwino, kukhuthala, kukhazikika, kupanga filimu ndi lubricity, ndipo imagwiritsidwa ntchito kwambiri m'magawo otsatirawa:
Zipangizo zomangira: Pazomangira, hydroxyethyl cellulose imagwiritsidwa ntchito makamaka ngati chowonjezera komanso chosungira madzi pazinthu zopangira simenti ndi zida za gypsum. Ikhoza kupititsa patsogolo ntchito yomanga, kukonza kusungirako madzi, kugwira ntchito ndi anti-sagging yamatope, kuwonjezera nthawi yotseguka ndikuonetsetsa kuti ntchito yomanga ikupita patsogolo.
Makampani opanga utoto: Pa penti, hydroxyethyl cellulose imagwiritsidwa ntchito ngati thickener, suspending agent ndi emulsifier kuwongolera rheology ndi kukhazikika kwa utoto, kuteteza pigment sedimentation, komanso kukulitsa kusalala ndi gloss kwa zokutira.
Zodzoladzola ndi zinthu zosamalira munthu: Mu zodzoladzola, hydroxyethyl cellulose imagwiritsidwa ntchito ngati thickener, filimu kale ndi moisturizer. Zitha kupereka mankhwala ndi kumva bwino, kusintha mankhwala bata ndi adhesion, ndi kumapangitsanso moisturizing kwenikweni.
Makampani opanga mankhwala: M'munda wamankhwala, hydroxyethyl cellulose imagwiritsidwa ntchito ngati chothandizira pokonzekera mankhwala. Monga chigawo cha mapiritsi omasulidwa mosalekeza, zokutira mafilimu, ndi zina zotero, zimatha kulamulira mlingo wa kutulutsidwa kwa mankhwala ndi kupititsa patsogolo kukhazikika ndi bioavailability wa mankhwala.
Makampani azakudya: M'makampani azakudya, hydroxyethyl cellulose imagwiritsidwa ntchito ngati chowonjezera chazakudya kuti chithandizire kukulitsa, kukulitsa komanso kukhazikika. Amagwiritsidwa ntchito kwambiri muzakumwa, zokometsera, mkaka ndi zakudya zina kuti zisinthe mawonekedwe ndi kukoma kwazinthu.
Ma cellulose a Hydroxyethyl alinso ndi ntchito zofunika kwambiri pochotsa mafuta, kupanga mapepala, kusindikiza nsalu ndi kupanga utoto. Pochotsa mafuta, hydroxyethyl cellulose imagwiritsidwa ntchito ngati thickener ndi stabilizer pobowola madzi, zomwe zimatha kusintha kuyimitsidwa kwamadzi obowola ndikuletsa kugwa kwa khoma. M'makampani opanga mapepala, amagwiritsidwa ntchito ngati chosungira komanso chothandizira kuti apange mphamvu ndi kulimba kwa pepala. Posindikiza nsalu ndi utoto, hydroxyethyl cellulose imagwiritsidwa ntchito ngati thickener kuthandiza slurry yosindikiza ndi yopaka utoto kuti igawidwe mofanana ndikuwongolera kusindikiza ndi utoto.
Ma cellulose a Hydroxyethyl amachokera ku cellulose yachilengedwe kudzera pamachitidwe angapo amankhwala. Kugwiritsiridwa ntchito kwake kwakukulu sikuli kokha chifukwa cha katundu wake wabwino kwambiri wa thupi ndi mankhwala, komanso chifukwa chakuti amatha kupereka mayankho osiyanasiyana m'mafakitale ambiri kuti akwaniritse zosowa zosiyanasiyana zaumisiri.
Nthawi yotumiza: Aug-13-2024